package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @author 猛在王
 * @version 1.0
 * @date 29/6/2024 下午9:15
 * @description ReportServiceImpl
 * @since 1.0
 */
@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //存储时间
        List<LocalDate> dateList = getDateList(begin, end);

        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户数量统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        //存储时间
        List<LocalDate> dateList = getDateList(begin, end);

        //存储每日新增用户
        List<Integer> newUserList = new ArrayList();
        //存储每日总用户数量
        List<Integer> totalUserList = new ArrayList();

        for (LocalDate date : dateList) {
            //获取每天开始时间和结束时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end",endTime);

            //查询每日总用户数量
            Integer totalUser = userMapper.getUserCount(map);
            totalUserList.add(totalUser);

            //查询每日新增用户
            map.put("begin",beginTime);
            Integer newUser = userMapper.getUserCount(map);
            newUserList.add(newUser);
        }

        //封装数据
        UserReportVO userReportVO = UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();

        return userReportVO;
    }

    /**
     * 订单完成率统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO orderStatistics(LocalDate begin, LocalDate end) {
        //存储时间
        List<LocalDate> dateList = getDateList(begin, end);
        //存储每日订单数量
        List<Integer> orderDayList = new ArrayList();
        //存储每日有效订单数量
        List<Integer> orderEffectiveList = new ArrayList();

        for (LocalDate date : dateList) {
            //每日订单数量
            Integer orderDay = getOrderCount(date, null);
            orderDayList.add(orderDay);

            //每日有效订单数量
            Integer orderEffective = getOrderCount(date, Orders.COMPLETED);
            orderEffectiveList.add(orderEffective);
        }

        if (orderDayList == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //获取订单总数
        Integer totalOrder = orderDayList.stream().reduce(Integer::sum).get();

        //获取有效订单总数
        if (orderEffectiveList == null){
            throw new OrderBusinessException("当前没有有效订单");
        }
        Integer totalEffectiveOrder = orderEffectiveList.stream().reduce(Integer::sum).get();

        //获取订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrder != 0){
            orderCompletionRate = totalEffectiveOrder.doubleValue()/ totalOrder;

        }
        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderDayList, ","))
                .validOrderCountList(StringUtils.join(orderEffectiveList, ","))
                .totalOrderCount(totalOrder)
                .validOrderCount(totalEffectiveOrder)
                .orderCompletionRate(orderCompletionRate)
                .build();
        return orderReportVO;
    }

    /**
     * 销量前十统计
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO salesTop10Statistics(LocalDate begin, LocalDate end) {
        //获取开始时间和结束时间
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> goodsSalesDTOS = orderMapper.salesTop10(beginTime, endTime);

        List<String> nameList = goodsSalesDTOS.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = goodsSalesDTOS.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        //封装数据
        SalesTop10ReportVO salesTop10ReportVO = SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList,","))
                .numberList(StringUtils.join(numberList,","))
                .build();
        return salesTop10ReportVO;
    }

    /**
     * 获取时间
     * @param begin
     * @param end
     * @return
     */
    private List<LocalDate> getDateList(LocalDate begin, LocalDate end){

        List<LocalDate> dateList = new ArrayList();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }

    /**
     * 获取每日订单数量
     * @param date
     * @return
     */
    private Integer getOrderCount(LocalDate date, Integer status){
        //获取每天开始时间和结束时间
        LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end",endTime);
        map.put("status",status);

        Integer orderCount = orderMapper.countByMap(map);
        return orderCount;
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


}
